import java.util.Scanner;
import java.util.*;
public class slove{
	public static void main(String[] args){
		Scanner stdIn = new Scanner(System.in);
		int P1 = stdIn.nextInt();
		int P2 = stdIn.nextInt();
		int N = stdIn.nextInt();
		int[] R = new int[N];
		List<Integer> list = new ArrayList<Integer>();
		int count = 0;
		int loss = 0;
		for(int i = 0; i < N; i++){
			R[i] = stdIn.nextInt();
		}
		for(int i = 0; i < N; i++){
			for(int j = i+1; j < N; j++){
				if(!list.contains(R[i])){
					list.add(R[i]);
					if(R[i] == R[j])
						count++;
				}else
					continue;
			}
		}
		loss = P1 * count + P2 * count;
		System.out.println(loss);
	}
}